JP3418866B2 - Knock type sharp pencil - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a knock-type sharp pencil, and more particularly to a knock-type sharp pencil in which mechanical parts such as a core tank and a chuck are attached to a connector and the connector is incorporated into a barrel. It is related.

[0002]

2. Description of the Related Art Knock type sharp pencils have a lead-out mechanism for letting out a lead by a knocking operation in a barrel, and this lead-out mechanism fits a lead tank, a spring and a tightening ring. Various types of sharp pencils have been used, including a attached chuck and the like, these parts being attached to a connector and the connector being incorporated in a barrel. To fix the connector in the shaft cylinder, the connector is press-fitted in the shaft cylinder, or a projection is provided so as to engage with the rear part of the connector when the connector is inserted into the shaft cylinder. for that reason,
In the sharp pencil having the connector fixed by such a configuration, it is difficult to easily remove and repair the fixing when the fixing becomes uncertain, the core is broken, or the core is clogged.

[0003]

The problems to be solved by the present invention are as follows.
In the knock-type sharp pencil in which the lead-out mechanism is attached to the connector as described above and the connector is inserted and fixed in the barrel, the connector can be easily and surely assembled, and when desired, Another object of the present invention is to provide a knock type sharp pencil in which the connector can be easily removed from the barrel.

[0004]

According to the present invention, in a knock-type sharp pencil in which a connector having a lead tank or the like attached thereto is inserted into a barrel and assembled, the lead tank is rotated with respect to the connector. A knock-type shatter, which is immovably and movably connected in the axial direction, and is provided with an engaging portion which is engageable with the outer peripheral surface of the connector and the inner surface of the barrel by rotating the connector. -Puppencils are provided to solve the above problems.

[0005]

1 and 2 show an embodiment of the present invention, FIG. 1 shows a state in which a connector (2) is incorporated in a barrel (1), and FIG. 2 is a barrel. 3 shows a connector assembly (3) in which the respective parts constituting the lead-out mechanism are attached to the connector (2) before being incorporated into the connector.

The connector- (2) is shown in the drawing as
It has a front tubular portion (4) and a rear tubular portion (5) formed to have a diameter larger than that of the front tubular portion (4). A step portion (6) is formed inside the front tubular portion (4), and a core tank (7) and a spring (for biasing the core tank (7) rearward from the rear of the step portion (6) ( 8) is inserted. From the front of the step (6),
The chuck (10) fitted with the tightening ring (9) is inserted,
The rear end of the chuck (10) is connected to the front end of the lead tank (7). Due to the biasing action of the spring (8), the flange (11) of the tightening ring (9) abuts the step (6).

In front of the step (6), the chuck (1
The contact portion (12) is provided at a position facing the flange (11) of the tightening ring (9) so as to release the tightening of the chuck by the tightening ring (9) when the (0) advances by a predetermined amount. Has been. The contact portion may be fixedly provided by forming a shoulder portion (not shown) having a small diameter in the connector, but in the figure, the connector (2) has a slit having a substantially U-shaped cross section. (1
3) is opened to form a swingable elastic piece (14).
When the outer end (15) of (14) is pressed, the inner end (16) moves to the inward protruding position of the connector (2), and the inner end (16) contacts the contact portion (12). ). As will be described later, the outer end (15) of the elastic piece (14) is pressed by the inner surface of the shaft cylinder (1) when the connector assembly (3) is inserted into the shaft cylinder (1). It

A slider (17) is provided at the tip of the connector (2) so as to be movable in the axial direction. The slider (17) has a lead holding portion that frictionally holds the lead (18). In the figure, the lead holding portion is a sandwiching portion (19) due to the elastic force of the slider itself or the elastic force of a lead holding piece (not shown) formed so as to be expandable by providing a slit in the slider. Although the core is held, as is known, an elastic piece (breaker) (not shown) such as rubber may be used.

A protrusion (20) is formed on the outer circumference of the slider (17), and the protrusion (20) is inserted from the opening (21) formed at the tip of the connector (2) into the long groove (22). Have been inserted into.
Engaging edges (23), () with which the protrusion (20) engages so as to lock the movement of the slider (17) at the rear end position and the forward position of the slider in the long groove (22). 24) is provided. This locking action is such that the above-mentioned engagement at the retracted position is released by the forward force when the lead is advanced by the lead-out mechanism, and the engagement at the forward position is released by the pressing force when the tip of the slider is pressed against the paper surface. And

In the drawing, the tip of the shaft cylinder is formed in a taper shape, but a tip tool is formed separately, and the tip tool is screwed, press-fitted, or any other suitable connecting means. It may be connected to the tip of the shaft cylinder (not shown). In this case, the tip may be provided with a contact portion (12) against which the above-mentioned tightening ring contacts, a slider (17), a lead protection pipe (not shown), and the like.

The core tank (7) has a connector (2).
Is non-rotatable and axially movable. Such a connecting structure can be formed in various ways. In FIG. 1 etc., as shown in FIG. 3, a locking protrusion (25) extending in the axial direction is formed on the core tank (7), and the locking protrusion (25) is formed on the connector (2). It is slidably engaged with the stop groove (26), but as shown in FIG. 4 (A), the locking projection (25) is provided on the connector side and the locking groove (26) is formed on the core tank side. You may do it. Also, as shown in FIG. 4B, the outer surface (27) of the lead tank (7) and the connector (2)
The inner surface (28) may have an irregular cross section such as a polygonal shape, or may be formed into an elliptical shape or the like and engaged so as to be movable in the axial direction.

Engagement portions that can be engaged by rotating the connector are provided on the outer peripheral surface of the connector and the inner surface of the barrel. In the present invention , the engagement portion is an engagement
It is composed of a claw and a receiving groove , and the connector and the shaft cylinder are engaged by rotating the connector through the lead tank.

In the embodiment shown in FIG. 1 , the engaging portion has an engaging claw (31) provided on the shaft tube (1) and a substantially inverted L shape provided on the rear tube part (5) of the connector (2). It is composed of a receiving groove (32). The receiving groove (32) is provided with an inlet portion (33) that opens in the axial direction on the end surface side of the rear tubular portion (5) so that the engaging claw (31) can be inserted, and a peripheral portion following the inlet portion (33). Insertion part (3
4), after inserting the engaging claw (31) to a position facing the insertion part (34), when the connector is rotated, the engagement claw (31) entered from the above-mentioned inlet part 34) Enter the connector and
(2) is fixed to the barrel (1). The receiving groove as described above may be formed on the shaft tube (1) side, and the engaging claw may be provided on the connector (2) side (not shown).

FIG. 5 shows another embodiment of the engaging portion. In the figure, the insertion gap (35) is opened on the inner surface of the shaft cylinder (1) to form the shaft cylinder side engagement claws (36) ...
The connector-side engagement claw (3
7) ... is formed. Then, the connector-side engaging claw (37) is inserted from the insertion gap (35) to a position facing the lower surface of the barrel-side engaging claw (36), and the connector is rotated to the connector-side. The engaging claws (37) ...
6) is engaged in the receiving groove (38) on the lower surface.

To assemble the above-mentioned sharp pencil,
First, as shown in FIG. 2, a connector tank (7), a spring (8), a chuck (10), a slider (17), etc. are sequentially assembled in a connector (2) to form a connector assembly (3). .
Next, this connector assembly (3) is inserted into the barrel (1), and the connector is rotated through the lead tank (7) projecting to the rear end side of the barrel (1). Then, the connector and the engaging portion provided on the barrel may be engaged. Note that a knock button, an eraser cap (not shown), or the like may be provided in the rear portion of the lead tank in a non-rotating state, and the lead tank may be rotated via these. By rotating the lead tank in the opposite direction, the connector-assembly (3) can be taken out by disengaging the engaging portion between the connector and the barrel.

In the figure, the rear tube portion (5) of the connector (2) enters the rear hole (39) of the shaft tube (1) and the front tube portion (4) enters the front hole (40). End face (41) of tube (5)
The front end surface (43) of the front tube portion (4) is replaced with the front step (44) instead of the rear step.
You may try to hit. Also, the connector- (2)
Is formed in a cylindrical shape having a substantially uniform thickness, the hole of the shaft cylinder (1) is also made to have a substantially uniform inner diameter, and the engaging portions provided on the connector and the shaft cylinder are provided at appropriate positions in the axial direction. You may make it formed in. An appropriate lock mechanism or the like may be provided at an appropriate position so as to prevent the connector from loosening when the connector is rotated and engaged with the barrel by the engaging portion.

[0017]

The present invention is constructed as described above, and connects the core tank to the connector so as to be non-rotatable and axially movable, and the connector is provided on the outer peripheral surface of the connector and the inner surface of the barrel. -The engaging claw and the receiving groove that can be engaged by rotating
Since the engaging portion is provided, the core tank, the spring, the chuck, the tightening ring, and the like, which constitute the core feeding mechanism, are attached to the connector, and then the connector is inserted into the barrel to set the core tank. If the connector is rotated via the
Can be securely fixed to the shaft cylinder, and if the core tank is rotated in the opposite direction, the engagement between the connector and the shaft cylinder can be disengaged, and the connector can be removed from the shaft cylinder. The breakdown can be easily repaired.

[Brief description of drawings]

1A and 1B show an embodiment of the present invention, in which FIG. 1A is an overall sectional view, and FIG. 1B is a front view in which only a shaft cylinder portion is sectionaled.

FIG. 2 is a sectional view of a connector-assembly.

FIG. 3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a cross-sectional view showing another embodiment of the connected state of the connector and the lead tank.

5A and 5B show another embodiment of an engaging portion between a connector and a shaft cylinder, in which FIG. 5A is a transverse sectional view and FIG.

[Explanation of symbols]

1 Shaft 2 Connector-3 Connector-Assembly 7 Core Tank 8 Spring 9 Tightening Ring 10 Chuck 1
7 Slider-29 Male screw 30 Female screw 3
1 Engaging claw 32 Receiving groove

Claims (3)

(57) [Claims] 1. A knock-type sharpening pencil in which a lead-out mechanism such as a lead tank is attached to a connector, and the connector is inserted and fixed in a barrel, wherein the lead tank is connected to the connector. Engagement claws that are non-rotatable and axially movable and that can be engaged with the outer peripheral surface of the connector and the inner surface of the barrel by rotating the connector .
A knock-type sharp pencil, characterized in that an engaging portion formed by a groove and a receiving groove is provided. 2. The engaging claw is provided on a shaft cylinder, and the receiving groove is provided.
The knock-type sharpening pencil according to claim 1 , wherein the connector is provided in a substantially inverted L shape on the connector . 3. An inner surface of the shaft cylinder and an outer peripheral surface of the connector.
Shaft cylinder side engagement claw and connector-side engagement claw with insertion gap
And the connector-side engaging claws on the lower surface of the barrel-side engaging claw
The knock-type sharpening pencil according to claim 1, which is adapted to be engaged with the receiving groove of the.